Question: The following quotes for cleaning cost have been obtained from a random simple of 12 providers chosen from a much larger population, prior to awarding a contract for these services:

$114, 154, 142, 132, 127, 145, 135, 138, 126, 142, 135, 124

a. Approximately how far is the average of these 12 quotes from the unknown mean for the entire population of providers

b. Find the 95% confidence interval for the population mean quote

c. Find the 99% confidence interval for the population mean quote

d. Find the one sided 95% confidence interval that claims that the population mean quote is no larger tan some value.

e. Find the one sided 99% confidence interval that claims that the population mean quote is no larger tan some value.